Andromeda I
E100927
Andromeda I is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy (M31) located within the Local Group.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Andromeda I canonical | 7 |
How this entity was disambiguated
This entity first appeared as the object of triple T869157 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Andromeda I Context triple: [Local Group, contains, Andromeda I]
-
A.
Triangulum Galaxy
The Triangulum Galaxy is a nearby spiral galaxy in the Local Group, notable as one of the closest large galaxies to the Milky Way and a companion to the Andromeda Galaxy.
-
B.
Andromeda Galaxy
The Andromeda Galaxy is the nearest large spiral galaxy to the Milky Way and is on a collision course to eventually merge with it.
-
C.
Canis Major Dwarf Galaxy
The Canis Major Dwarf Galaxy is a nearby, faint irregular dwarf galaxy thought to be the closest known satellite galaxy to the Milky Way and currently being tidally disrupted by it.
-
D.
Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius Dwarf Spheroidal Galaxy is a small, elongated satellite galaxy currently being tidally disrupted and absorbed by the Milky Way.
-
E.
Magellanic Clouds
The Magellanic Clouds are two irregular dwarf galaxies orbiting the Milky Way, prominently visible from the Southern Hemisphere as hazy patches in the night sky.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Andromeda I Target entity description: Andromeda I is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy (M31) located within the Local Group.
-
A.
Triangulum Galaxy
The Triangulum Galaxy is a nearby spiral galaxy in the Local Group, notable as one of the closest large galaxies to the Milky Way and a companion to the Andromeda Galaxy.
-
B.
Andromeda Galaxy
The Andromeda Galaxy is the nearest large spiral galaxy to the Milky Way and is on a collision course to eventually merge with it.
-
C.
Canis Major Dwarf Galaxy
The Canis Major Dwarf Galaxy is a nearby, faint irregular dwarf galaxy thought to be the closest known satellite galaxy to the Milky Way and currently being tidally disrupted by it.
-
D.
Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius Dwarf Spheroidal Galaxy is a small, elongated satellite galaxy currently being tidally disrupted and absorbed by the Milky Way.
-
E.
Magellanic Clouds
The Magellanic Clouds are two irregular dwarf galaxies orbiting the Milky Way, prominently visible from the Southern Hemisphere as hazy patches in the night sky.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Local Group galaxy
ⓘ
dwarf spheroidal galaxy ⓘ satellite galaxy ⓘ |
| absoluteMagnitudeV | approximately −11.7 ⓘ |
| alternativeName |
And I
ⓘ
PGC 2554 ⓘ
linked to:
NGC 205
UGC 245 ⓘ |
| apparentMagnitudeV | approximately 13.7 ⓘ |
| baryonicContent | dominated by old stars ⓘ |
| belongsTo | satellite system of M31 ⓘ |
| belongsToSatelliteSystemOf | Andromeda Galaxy ⓘ |
| catalog | Andromeda satellite system ⓘ |
| constellation | Cassiopeia ⓘ |
| darkMatterContent | high mass-to-light ratio ⓘ |
| declination | +38° ⓘ |
| discoveredBy | Sidney van den Bergh ⓘ |
| discoveryLocation | Mount Wilson Observatory ⓘ |
| discoveryMethod | photographic plates ⓘ |
| discoveryYear | 1970 ⓘ |
| distanceFromAndromedaGalaxy |
approximately 190,000 light-years
ⓘ
approximately 58 kiloparsecs ⓘ |
| distanceFromEarth | approximately 2.4 million light-years ⓘ |
| dominantStellarPopulationAge | older than 8 billion years ⓘ |
| environment | halo of the Andromeda Galaxy ⓘ |
| galaxyType | dwarf spheroidal ⓘ |
| gasContent | very low ⓘ |
| gasPhase | mostly depleted of neutral hydrogen ⓘ |
| halfLightRadius | approximately 0.7 kiloparsecs ⓘ |
| hasGlobularClusters | few or none detected ⓘ |
| hostGalaxy |
Andromeda Galaxy
ⓘ
M31 ⓘ
linked to:
Andromeda Galaxy
|
| isGravitationallyBoundTo | Andromeda Galaxy ⓘ |
| isSatelliteOf | Andromeda Galaxy ⓘ |
| locatedInSupercluster |
Local Supercluster
ⓘ
linked to:
Virgo Supercluster
|
| luminosityClass | dwarf ⓘ |
| memberOf | Local Group ⓘ |
| metallicity | low ⓘ |
| morphologicalType | dSph ⓘ |
| observedIn |
near-infrared wavelengths
ⓘ
optical wavelengths ⓘ |
| radialVelocity | approximately −375 km/s ⓘ |
| radius | approximately 1 kiloparsec ⓘ |
| rightAscension | 00h 45m ⓘ |
| rotation | little or no ordered rotation detected ⓘ |
| shape | elliptical ⓘ |
| starFormationActivity | quiescent ⓘ |
| stellarPopulation | old ⓘ |
| surfaceBrightness | low ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Andromeda I Description of subject: Andromeda I is a dwarf spheroidal satellite galaxy of the Andromeda Galaxy (M31) located within the Local Group.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.